Exhaust improvements

[Cloud Warrior]

Came across an advert on Barnstormers where a company claims an improvement of 10 - 12 HP on standard Rotax 582 using a special exhaust. The exhaust's are really designed for Rotax 583 engines (made for snowmobiles - looks very similar to 582 but with RAVE) but they seem to use them on aeries as well in the US of A.

I know that a 2 stroke engine's performance is very dependent on its exhaust - has someone ever tried to tinker with this on their trikes? Would fitting something like this damage the engine?

[Duck Rogers]

There's a whole lot been said over the years about the pros and cons of the tuned pipe exhaust on an aviation engine. A lot of knowledgeable people are against it. Apparently the pipe "makes power" in a small band at high revs which is not really what you want in an aviation engine.
Others (mainly the peddlers of these products) are denying it and claiming their pipes are suitable for a wide range of rpm's. There's forever a load of mud being slung backwards and forwards about this :D

I personally don't think it's a great idea. Rotax has spent the time and money on the R&D and they have, as far as I'm concerned, the right pipes for the right application.

Aerosan used to race 2 cycle motorcycles and I know they used them extensively on their machines. He may be better qualified to advise you.

I have personally spoken to the guy (name intentionally withheld) at R&D Aerosport in the US, that make a lot of these pipes and I can only say that he was less than helpful and vague about the "power band" that these pipes operate in and he also said that it's a nonsense what everyone's on about a restricted power band and limited rpm range.

I personally don't believe him as my understanding of how a tuned pipe works is exactly as I described it above.

It may be fine for the sleds they use but not for aviation

......my Z$1 000,00 worth..... :D

Duck Rogers

[Cloud Warrior]

Thanks Duck - that was the message I got having done a bit more research on the net.

I got a one liner back from the guy on Barnstormers and he was really helpful and friendly (not!)

[Duck Rogers]

I got a one liner back from the guy on Barnstormers and he was really helpful and friendly (not!)

Hmmm...let me guess..the same guy I was referring to

Duck Rogers

[Morph]

yip, you really have to be carefull about the "I can double the output power with just one component" thing. Typically what that means is take a 1000hour engine, hit it with a hot exhaust, push it's power to 150% of normal, and reduce it's lifespan to 100 hours.

No a nicely tuned standard 503 will work fine thank you. You want more power then go for a nicely tuned standard 582, or even if you hit the lotto a nicely tuned 912S.

Hot engines are just that, hot. They also tend to burn out.

Long live the 503 :D .

[Duck Rogers]

Hot engines are just that, hot. They also tend to burn out.

QUICKLY ....and then so does your ass

Duck Rogers

[Morph]

QUICKLY ....and then so does your ass
Duck Rogers

Hey,
how did you know I ate chillies today

[DarkHelmet]

Like Morph I like chillies, but then I know what I eat and suffer the consequences from my personal "exhaust" cause I have very accurate sensors to what is passing through it!

Fiddling with a proven design might make me s417 more the next flight than what I am prepared to ingest the night before!

I prefer chillies... My real exhaust can handle what I fling at it with my right foot just fine!

[Aerosan]

I short Ill say this, a tuned exhaust does add a lot of power BUT your reliability is staight out the window A pipe can be manufactured for various applications and power bands (all within reason of course) but again you will have to play and find a pipe that suits your application, flying style etc. I for one would not advise this

My 2c -San